The assessment of shape deformation and stress for the ear canal with earplug

• Main Authors: Tsai, Sung-Feng, 蔡松峰
• Other Authors: Chen, Ching I
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/ryp6d8

碩士 === 中華大學 === 機械工程學系碩士班 === 101 === For the occupational noise, there are laws and regulations, anti-noise protection with the right to wear, but not the size of the ear canal for domestic labor domestic and match the right earplug, resulting in domestic labor is often due to wear earplugs to produce comfort, but do not want to wear endless making further noise to hearing loss risk at work, Therefore, this study will start with the noise more workplace labor external ear canal measurement, thereby establishing a database of domestic labor external auditory canal measurement, and wear in one ear, one ear without wearing the ear external ear canal shape change measurement and data collection for the human ear by ear plugs to wear through a subjective questionnaire survey, as well as objective type of measurement to wear earplugs, canal wall pressure set to wear anti-noise earplugs comfort of performance indicators, and hope that through this survey to enhance the earplug comfort, wear a willingness to raise labor population.. In finite element analysis, the loading condition is the standard displacement level 1.2 cm. The analysis is performed loading-displacement 0.1 cm to 1.2 cm when the pressure inside the ear canal. Analog vivo canal pressure values and calculated pressure sensing value compared with each other authentication. According to FEA results, conclusions the comments can be addressed as follows: (1) Young's modulus of the material properties on the ear is not much affected, the earplug into the ear canal, 1.2 cm, the Young's coefficient of 32 MPa and 1260 MPa, the pressure difference between the results of 13 % to prove Young's coefficient is relatively small for the ear canal pressure has slowed the phenomenon; (2) The market earbud size number A, B, C, D, results from the pressure of the ear size of minimum pressure D, in line with the expectations, the load displacement D number from 0.1 ~ 1.2 cm, respectively, pressure 0 psi, 0 psi, 0 psi, 0.01 psi, 2.61 psi, 4.93 psi, 5.71 psi, 8.05 psi, 11.41 psi, 23.2 psi, ear plugs into the ear canal displacement of 0.65 cm ~ 0.8 cm interval, the pressure is 0.01 psi ~ 4.93 psi range, the ear crossing is usually oval, but the closer the first curve, the shape of the ear canal gradually render round, thus determining the size of the earbuds design trends around a small, enclosed under a large, full-length is longer, the pressure inside the ear canal can improve the situation.